FWU: Align FWU to FF 1.1

Ailgn FWU service to FF1.1 and convert it into a stateless service.

Signed-off-by: Sherry Zhang <sherry.zhang2@arm.com>
Change-Id: I5719b52e30ba839ab36094005c6e9fc56ad26962
diff --git a/interface/include/tfm_fwu_defs.h b/interface/include/tfm_fwu_defs.h
index 9041fd3..fe7e2bf 100644
--- a/interface/include/tfm_fwu_defs.h
+++ b/interface/include/tfm_fwu_defs.h
@@ -19,6 +19,14 @@
 #define FWU_IMAGE_TYPE_SECURE           0x02U
 #define FWU_IMAGE_TYPE_FULL             0x03U
 
+/* FWU message types that distinguish FWU services. */
+#define TFM_FWU_WRITE                1001
+#define TFM_FWU_INSTALL              1002
+#define TFM_FWU_ABORT                1003
+#define TFM_FWU_QUERY                1004
+#define TFM_FWU_REQUEST_REBOOT       1005
+#define TFM_FWU_ACCEPT               1006
+
 #ifdef __cplusplus
 }
 #endif